Improvement in rock-drills



W. H. WRIGHT.

' ROCK-DRILL. No175,Z33 Patented March 21,1876.

WITNESSES 9% lily/EOE?! l monunsQ NJETERS, PHDTO-LIYHOGRAFNER,WASHINGTON D c.

UNITED STATES PATENT QFFICE.

WILLIAM H. WRIGHT, OF SUNBURY, PENNSYLVANIA, ASSIGNOR TO HIM- SELF ANDJOHN WRIGHT, 9F SAME PLACE.

IMPROVEMENT IN ROCK-DRILLS.

Specification forming part of Letters Patent No. 1 75,233, dated March21, 1876; application filed March 6, 1876.

,To all whom it may concern:

Be it known that I, WILLIAM H. WRIGHT, of Sunbury, in the county ofNorthumberland and State of Pennsylvania, have invented a new andImproved Drill, of which the 'following is a specification:

In the accompanying drawing, Figure 1 represents a side elevation of myimproved drill, and Fig. 2 a bottom view of the screw-nut for attachingfeed-screw.

' Similar letters of reference indicate corresponding parts.

The object of my invention is to provide for miners a drill for boringcoal and rock, that is attached directly to the material to be drilled,without props or supports, and which allows the change of drills to suitthe depth of borehole and material without removing the frame.

The invention consists of a frame with stationary or adjustable prongs,and a sectional screw-nut with link for interchanging the drill.

In the draping, A represents the frame of my improved coal and rockdrill, which has a raised central part, with the screwnut or socket forthe feed screw, and stationary or adjustable prongs A,with suitableset-screws B, by which the frame is rigidly secured to holes or recessescut into the coal or rock by a pick. Before the frame is attached to thecoal or rock the feed-screw and drill are taken out of the frame byopening the sectional screw-nut D and removing the feed-screw 0.

The screw-nut D is made of two symmetrical parts, which are attached atone end by pivotbolts to the central partof frame A, which is recessedto such width that the drills required for boring pass readily throughthe same.

The opposite ends of the nut-sections are locked to the frame by a link,D, that is placed over the same after the feed-screw is inserted. Byremoving the link the nut-sections may be turned outwardly on thepivotbolts, and the feed-screw and drill readily taken out for beingreplaced by a longer drill, and so on.

A hole of any length may thus be bored by inserting drills increasing inlength in consecutive order, the frame remaining in position until thedrill-hole is entirely completed.

The machine is quickly set in position, and the drilling of the holerapidly accomplished, as the interchanging of the different drills iseasily attended to.

The same machine may be made available for coal or rock by providing itwith separate feed-screws and nuts for each purpose.

In case itshouldbe necessary to prevent the vibrating of the drill, astay or brace may be provided, to give the required rigidity to thedrill-frame.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. The improved machine for drilling boreholes in coal or rock, composedof a supporting-fra me with stationary or adjustable prongs andset-screws, and with a sectional screw-nut and link for taking out thefeed-screw and interchanging the drills, substantially in the manner andfor the purpose set forth.

2. The combination of the frame A, having recess to pass the feed-screwand drill, with a screw-nut made of symmetrical sections, ap-

plied to pivot-bolts, and locked by a sliding link, substantially as setforth.

WILLIAM H. WRIGHT. Witnesses:

Tnos. M. PURsEL, T. D. GRANT.

